Midfielder Park Ji Sung ended his seven-year stay at Manchester United on Monday by signing a two-year contract with English Premier League team Queens Park Rangers.

The South Korean, who made 100 appearances for his country before retiring from international football in January 2012, has moved to the London club for an undisclosed fee, reported to be in the region of $7.75 million.

"This is a real coup for QPR," manager Mark Hughes, who also used to play for United, told the club's official website.

"We are delighted Ji is going to join us because his record speaks for itself. He has been a big player for Manchester United and played a big part in their success in recent years.

"He is hugely respected there because of what he has achieved, his application to his work and the impact he has on games."

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Goal-line technology approved by FIFA

A legacy of controversies – Deciding whether or not a shot has crossed the line has long been an issue in football. Arguably the most famous incident was in the 1966 World Cup final, when England's Geoff Hurst saw his shot in extra-time bounce down off the underside of the West Germany crossbar. A goal was awarded, giving England a 3-2 lead, with the hosts going on to win the match 4-2.

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Azerbaijan folk hero – Hurst's goal was awarded after referee Gottfried Dienst consulted Azerbaijan linesman Tofik Bakhramov who judged the ball had bounced beyond the line. Azerbaijan's national stadium is named after folk hero Bakhramov, who even had a statue modelled in his honour.

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History repeated – England have been at the center of some of the most famous goal-line controversies. At the 2010 World Cup, England and Germany met again in the round of 16. With Germany leading 2-1, England's Frank Lampard hit a shot which struck the bar and landed well over the goal line, but no goal was awarded, and Germany won 4-1.

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Ukraine unlucky – At the Euro 2012 tournament, England were involved in controversy for a third time. Co-hosts Ukraine needed to beat England to advance from the group stage, but fell behind to a Wayne Rooney header. Artim Milevskiy thought his shot had crossed the line before John Terry was able to hook it clear, but once again no goal was given and Ukraine crashed out.

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A Mata of inches – Two months earlier Terry had been involved in another goal-line incident, this time for club team Chelsea. In an FA Cup semifinal with Tottenham Hotspur, Chelsea's Juan Mata hit a shot which was inadvertently blocked by Terry, but a goal was given and Chelsea won 5-1.

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Hawkeye – Hawkeye ball-tracking technology was first used in tennis in 2006, with players able to challenge calls by umpires and line judges. Each player is allowed three challenges in each set, but they do not lose a challenge if it the technology shows the umpire or line judge made the wrong call.

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Decision Referral System (DRS) – Other sports have embraced video technology. Cricket uses the Decision Referral System (DRS) to rule on leg before wicket (lbw) calls. Hawkeye ball-tracking software is used to see whether a delivery was in line to strike the stumps before hitting the batsman's leg.

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Television Match Official (TMO) – Both rugby codes -- league and union -- use a video referee to rule on whether a try should be awarded. The video referee was first introduced at the rugby league Super League World Nines tournament in 1996 and the "Television Match Official" is widely used in possible point-scoring situations.